IRF AFL27015DZ/CH Advanced analog high reliability hybrid dc/dc converter Datasheet

PD - 94435A
AFL270XXS SERIES
270V Input, Single Output
ADVANCED ANALOG
HIGH RELIABILITY
HYBRID DC/DC CONVERTERS
Description
The AFL Series of DC/DC converters feature high power
density with no derating over the full military temperature range. This series is offered as part of a complete
family of converters providing single and dual output
voltages and operating from nominal +28 or +270 volt
inputs with output power ranging from 80 to 120 watts.
For applications requiring higher output power, multiple
converters can be operated in parallel. The internal current sharing circuits assure equal current distribution
among the paralleled converters. This series incorporates Advanced Analog’s proprietary magnetic pulse
feedback technology providing optimum dynamic line
and load regulation response. This feedback system
samples the output voltage at the pulse width modulator
fixed clock frequency, nominally 550 KHz. Multiple converters can be synchronized to a system clock in the
500 KHz to 700 KHz range or to the synchronization
output of one converter. Undervoltage lockout, primary
and secondary referenced inhibit, soft-start and load
fault protection are provided on all models.
These converters are hermetically packaged in two enclosure variations, utilizing copper core pins to minimize resistive DC losses. Three lead styles are available, each fabricated with Advanced Analog’s rugged
ceramic lead-to-package seal assuring long term
hermeticity in the most harsh environments.
Manufactured in a facility fully qualified to MIL-PRF38534, these converters are available in four screening
grades to satisfy a wide range of requirements. The CH
grade is fully compliant to the requirements of MIL-PRF38534 for class H. The HB grade is fully processed and
screened to the class H requirement, but does not have
material element evaluated to the class H requirement.
Both grades are tested to meet the complete group “A”
test specification over the full military temperature range
without output power deration. Two grades with more
limited screening are also available for use in less
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AFL
Features
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160 To 400 Volt Input Range
5, 6, 9, 12, 15 and 28 Volt Outputs Available
High Power Density - up to 84 W /in3
Up To 120 Watt Output Power
Parallel Operation with Stress and Current
Sharing
Low Profile (0.380") Seam Welded Package
Ceramic Feedthru Copper Core Pins
High Efficiency - to 87%
Full Military Temperature Range
Continuous Short Circuit and Overload
Protection
Remote Sensing Terminals
Primary and Secondary Referenced
Inhibit Functions
Line Rejection > 60 dB - DC to 50KHz
External Synchronization Port
Fault Tolerant Design
Dual Output Versions Available
Standard Military Drawings Available
demanding applications. Variations in electrical,
mechanical and screening can be accommodated. Contact Advanced Analog for special requirements.
1
07/24/02
AFL270XXS Series
Specifications
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Soldering Temperature
Case Temperature
-0.5V to 500V
300°C for 10 seconds
Operating
-55°C to +125°C
Storage
-65°C to +135°C
Static Characteristics -55°C ≤ TCASE ≤ +125°C, 160 ≤ VIN ≤ 400 unless otherwise specified.
Group A
Subgroups
Parameter
Test Conditions
Note 6
INPUT VOLTAGE
Min
Nom
Max
Unit
160
270
400
V
5.00
6.00
9.00
12.00
15.00
28.00
5.05
6.06
9.09
12.12
15.15
28.28
V
V
V
V
V
V
5.10
6.12
9.18
12.24
15.30
28.56
V
V
V
V
V
V
16.0
13.5
10.0
9.0
8.0
4.0
A
A
A
A
A
A
80
81
90
108
120
112
W
W
W
W
W
W
VIN = 270 Volts, 100% Load
OUTPUT VOLTAGE
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
1
1
1
1
1
1
4.95
5.94
8.91
11.88
14.85
27.72
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
2, 3
2, 3
2, 3
2, 3
2, 3
2, 3
4.90
5.88
8.82
11.76
14.70
27.44
VIN = 160, 270, 400 Volts - Note 6
OUTPUT CURRENT
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
Note 6
OUTPUT POWER
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
µfd
MAXIMUM CAPACITIVE LOAD
Note 1
OUTPUT VOLTAGE
TEMPERATURE COEFFICIENT
VIN = 270 Volts, 100% Load - Note 1, 6 -0.015
+0.015
%/°C
No Load, 50% Load, 100% Load
VIN = 160, 270, 400 Volts
-70.0
-10.0
+70.0
+10.0
mV
mV
-1.0
+1.0
%
30
35
40
45
50
100
mVpp
mVpp
mVpp
mVpp
mVpp
mVpp
OUTPUT VOLTAGE REGULATION
AFL27028S
Line
All Others
Line
Load
OUTPUT RIPPLE VOLTAGE
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
VIN = 160, 270, 400 Volts, 100% Load,
BW = 10MHz
10,000
For Notes to Specifications, refer to page 4
2
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AFL270XXS Series
Static Characteristics (Continued)
Parameter
Group A
Subgroups
INPUT CURRENT
No Load
Inhibit 1
Inhibit 2
INPUT RIPPLE CURRENT
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
1
2, 3
1, 2, 3
1, 2, 3
LOAD FAULT POWER DISSIPATION
Overload or Short Circuit
Nom
VIN = 270 Volts
IOUT = 0
Pin 4 Shorted to Pin 2
Pin 12 Shorted to Pin 8
B.W. = 10MHz
VOUT = 90% VNOM
Max
Unit
15
17
3.0
5.0
mA
mA
mA
mA
60
60
70
70
80
80
mApp
mApp
mApp
mApp
mApp
mApp
125
115
140
%
%
%
30
W
Note 5
115
105
125
1
2
3
VIN = 270 Volts
1, 2, 3
VIN = 270 Volts, 100% Load
EFFICIENCY
AFL27005S
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
ENABLE INPUTS (Inhibit Function)
Converter Off
Sink Current
Converter On
Sink Current
SWITCHING FREQUENCY
SYNCHRONIZATION INPUT
Frequency Range
Pulse Amplitude, Hi
Pulse Amplitude, Lo
Pulse Rise Time
Pulse Duty Cycle
ISOLATION
Min
VIN = 270 Volts, 100% Load
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
CURRENT LIMIT POINT
Expressed as a Percentage
of Full Rated Load
Test Conditions
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
78
79
80
82
83
82
Logical Low, Pin 4 or Pin 12
Note 1
Logical High, Pin 4 and Pin 12 - Note 9
Note 1
-0.5
2.0
1, 2, 3
500
1, 2, 3
1, 2, 3
1, 2, 3
500
2.0
-0.5
Note 1
Note 1
1
Input to Output or Any Pin to Case
(except Pin 3). Test @ 500VDC
DEVICE WEIGHT
Slight Variations with Case Style
MTBF
MIL-HDBK-217F, AIF @ TC = 70°C
550
20
100
0.8
100
50
100
V
µA
V
µA
600
KHz
700
10
0.8
100
80
KHz
V
V
nSec
%
MΩ
85
300
%
%
%
%
%
%
82
83
84
85
87
85
gms
KHrs
For Notes to Specifications, refer to page 4
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3
AFL270XXS Series
Dynamic Characteristics -55°C ≤ TCASE ≤ +125°C, VIN = 270 Volts unless otherwise specified.
Parameter
Group A
Subgroup
s
AFL27006S
AFL27009S
AFL27012S
AFL27015S
AFL27028S
Min
Nom
Max
Unit
Note 2, 8
LOAD TRANSIENT RESPONSE
AFL27005S
Test Conditions
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 50% ⇔ 100%
-450
450
200
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
-450
450
400
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 50% ⇔ 100%
-450
450
200
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
-450
450
400
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 50% ⇔ 100%
-600
600
200
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
-600
600
400
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 50% ⇔ 100%
-750
750
200
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
-750
750
400
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 50% ⇔ 100%
-900
900
200
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
-900
900
400
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 50% ⇔ 100%
-1200
1200
200
mV
µSec
Amplitude
Recovery
4, 5, 6
4, 5, 6
Load Step 10% ⇔ 50%
-1200
1200
400
mV
µSec
-500
500
500
mV
µSec
250
120
mV
mSec
Note 1, 2, 3
LINE TRANSIENT RESPONSE
VIN Step = 160 ⇔ 400 Volts
Amplitude
Recovery
VIN = 160, 270, 400 Volts. Note 4
TURN-ON CHARACTERISTICS
Overshoot
Delay
4, 5, 6
4, 5, 6
Enable 1, 2 on. (Pins 4, 12 high or
open)
LOAD FAULT RECOVERY
Same as Turn On Characteristics.
LINE REJECTION
MIL-STD-461, CS101, 30Hz to 50KHz
Note 1
50
75
60
70
dB
Notes to Specifications:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Parameters not 100% tested but are guaranteed to the limits specified in the table.
Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of VOUT at 50% load.
Line transient transition time ≥ 100 µSec.
Turn-on delay is measured with an input voltage rise time of between 100 and 500 volts per millisecond.
Current limit point is that condition of excess load causing output voltage to drop to 90% of nominal.
Parameter verified as part of another test.
All electrical tests are performed with the remote sense leads connected to the output leads at the load.
Load transient transition time ≥ 10 µSec.
Enable inputs internally pulled high. Nominal open circuit voltage ≈ 4.0VDC.
4
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AFL270XXS Series
AFL270XXS Circuit Description
Figure I. AFL Single Output Block Diagram
DC INPUT
1
ENABLE 1
4
INPUT
FILTER
OUTPUT
FILTER
PRIMARY
BIAS SUPPLY
7
+ OUTPUT
10
+ SENSE
11
SHARE
12
ENABLE 2
CURRENT
SENSE
SYNC OUTPUT
5
SYNC INPUT
6
CASE
3
SHARE
CONTROL
.*
INPUT RETURN
ERROR
AMP
& REF
AMPLIFIER
SENSE
AMPLIFIER
2
Circuit Operation and Application Information
The AFL series of converters employ a forward switched
mode converter topology. (refer to Figure I.) Operation of
the device is initiated when a DC voltage whose magnitude
is within the specified input limits is applied between pins 1
and 2. If pin 4 is enabled (at a logical 1 or open) the primary
bias supply will begin generating a regulated housekeeping
voltage bringing the circuitry on the primary side of the converter to life. Two power MOSFETs used to chop the DC
input voltage into a high frequency square wave, apply this
chopped voltage to the power transformer. As this switching is initiated, a voltage is impressed on a second winding
of the power transformer which is then rectified and applied
to the primary bias supply. When this occurs, the input
voltage is shut out and the primary bias voltage becomes
exclusively internally generated.
The switched voltage impressed on the secondary output
transformer winding is rectified and filtered to provide the
converter output voltage. An error amplifier on the secondary side compares the output voltage to a precision reference and generates an error signal proportional to the difference. This error signal is magnetically coupled through
the feedback transformer into the controller section of the
converter varying the pulse width of the square wave signal driving the MOSFETs, narrowing the width if the output
voltage is too high and widening it if it is too low.
9
- SENSE
8
OUTPUT RETURN
used, the sense leads should be connected to their respective output terminals at the converter. Figure III. illustrates a
typical application.
Inhibiting Converter Output
As an alternative to application and removal of the DC
voltage to the input, the user can control the converter
output by providing TTL compatible, positive logic signals
to either of two enable pins (pin 4 or 12). The distinction
between these two signal ports is that enable 1 (pin 4) is
referenced to the input return (pin 2) while enable 2 (pin 12)
is referenced to the output return (pin 8). Thus, the user
has access to an inhibit function on either side of the isolation barrier. Each port is internally pulled “high” so that
when not used, an open connection on both enable pins
permits normal converter operation. When their use is
desired, a logical “low” on either port will shut the converter down.
Figure II. Enable Input Equivalent Circuit
+5.6V
100K
Pin 4 or
Pin 12
1N4148
Disable
290K
Remote Sensing
Connection of the + and - sense leads at a remotely locatled load permits compensation for resistive voltage drop
between the converter output and the load when they are
physically separated by a significant distance. This connection allows regulation to the placard voltage at the point
of application. When the remote sensing features is not
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2N3904
150K
Pin 2 or
Pin 8
5
AFL270XXS Series
Internally, these ports differ slightly in their function. In use,
a low on Enable 1 completely shuts down all circuits in the
converter while a low on Enable 2 shuts down the secondary side while altering the controller duty cycle to near zero.
Externally, the use of either port is transparent save for
minor differences in idle current. (See specification table).
level of +2.0 volts. The sync output of another converter
which has been designated as the master oscillator provides a convenient frequency source for this mode of operation. When external synchronization is not required, the
sync in pin should be left unconnected thereby permitting
the converter to operate at its’ own internally set frequency.
The sync output signal is a continuous pulse train set at 550
±50 KHz, with a duty cycle of 15 ±5%. This signal is referenced to the input return and has been tailored to be compatible with the AFL sync input port. Transition times are
less than 100 ns and the low level output impedance is less
than 50 ohms. This signal is active when the DC input
voltage is within the specified operating range and the converter is not inhibited. This output has adequate drive reserve to synchronize at least five additional converters. A
typical synchronization connection option is illustrated in
Figure III.
Synchronization of Multiple Converters
When operating multiple converters, system requirements
often dictate operation of the converters at a common frequency. To accommodate this requirement, the AFL series
converters provide both a synchronization input and output.
The sync input port permits synchronization of an AFL converter to any compatible external frequency source operating between 500 and 700 KHz. This input signal should
be referenced to the input return and have a 10% to 90%
duty cycle. Compatibility requires transition times less th an
100 ns, maximum low level of +0.8 volts and a minimum high
Figure III. Preferred Connection for Parallel Operation
Power
Input
1
12
Vin
Enable 2
Rtn
Share
Case
Enable 1
Optional
Synchronization
Connection
AFL
+ Sense
- Sense
Sync Out
Return
Sync In
+ Vout
7
6
Share Bus
1
12
Enable 2
Vin
Share
Rtn
Case
Enable 1
AFL
+ Sense
- Sense
Sync Out
Return
Sync In
+ Vout
to Load
7
6
1
12
Vin
Enable 2
Rtn
Share
Case
Enable 1
AFL
+ Sense
- Sense
Sync Out
Return
Sync In
+ Vout
7
6
(Other Converters)
Parallel Operation-Current and Stress Sharing
Figure III. illustrates the preferred connection scheme for
operation of a set of AFL converters with outputs operating
in parallel. Use of this connection permits equal sharing of
a load current exceeding the capacity of an individual AFL
among the members of the set. An important feature of the
6
AFL series operating in the parallel mode is that in addition
to sharing the current, the stress induced by temperature
will also be shared. Thus if one member of a paralleled set
is operating at a higher case temperture, the current it provides to the load will be reduced as compensation for the
temperature induced stress on that device.
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AFL270XXS Series
When operating in the shared mode, it is important that
symmetry of connection be maintained as an assurance of
optimum load sharing performance. Thus, converter outputs should be connected to the load with equal lengths of
wire of the same gauge and sense leads from each converter should be connected to a common physical point,
preferably at the load along with the converter output and
return leads. All converters in a paralleled set must have
their share pins connected together. This arrangement is
diagrammatically illustrated in Figure III. showing the outputs and sense pins connected at a star point which is
located close as possible to the load.
As a consequence of the topology utilized in the current
sharing circuit, the share pin may be used for other functions. In applications requiring a single converter, the voltage appearing on the share pin may be used as a “current
monitor”. The share pin open circuit voltage is nominally
+1.00v at no load and increases linearly with increasing
output current to +2.20v at full load. The share pin voltage is
referenced to the output return pin.
Thermal Considerations
Because of the incorporation of many innovative technological concepts, the AFL series of converters is capable of
providing very high output power from a package of very
small volume. These magnitudes of power density can only
be obtained by combining high circuit efficiency with effective methods of heat removal from the die junctions. This
requirement has been effectively addressed inside the device; but when operating at maximum loads, a significant
amount of heat will be generated and this heat must be
conducted away from the case. To maintain the case temperature at or below the specified maximum of 125°C, this
heat must be transferred by conduction to an appropriate
heat dissipater held in intimate contact with the converter
base-plate.
Because effectiveness of this heat transfer is dependent
on the intimacy of the baseplate/heatsink interface, it is strongly recommended that a high thermal conductivity heat
transferance medium is inserted between the baseplate and heatsink. The material most frequently utilized at the factory during all testing and burn-in processes is sold under
the trade name of Sil-Pad 4001 . This particular pro duct
is an insulator but electrically conductive versions are also
available. Use of these materials assures maximum surface contact with the heat dissipator thereby compensating
for minor variations of either surface. While other available
types of heat conductive materials and compounds may
provide similar performance, these alternatives are often
less convinient and are frequently messy to use.
A conservative aid to estimating the total heat sink surface
area (AHEAT SINK) required to set the maximum case temperature rise (∆T) above ambient temperature is given by
the following expression:
.
 ∆T −143

− 3.0
A HEAT SINK ≈ 
 80P 0.85 
where
∆T = Case temperature rise above ambient
 1

P = Device dissipation in Watts = POUT 
− 1
 Eff

As an example, it is desired to maintain the case temperature of an AFL27015S at ≤ +85°C in an area where the
ambient temperature is held at a constant +25°C; then
∆T = 85 - 25 = 60°C
From the Specification Table, the worst case full load efficiency for this device is 83%; therefore the power dissipation at full load is given by

 1
P = 120 • 
− 1 = 120 • ( 0.205) = 24.6 W
 .83 
and the required heat sink area is
.

 −143
60

A HEAT SINK = 
− 3.0 = 71 in 2
 80 • 24.6 0.85 
Thus, a total heat sink surface area (including fins, if any) of
71 in2 in this example, would limit case rise to 60°C above
ambient. A flat aluminum plate, 0.25" thick and of approximate dimension 4" by 9" (36 in2 per side) would suffice for
this application in a still air environment. Note that to meet
the criteria in this example, both sides of the plate require
unrestricted exposure to the ambient air.
1Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN
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7
AFL270XXS Series
Input Filter
The AFL270XXS series converters incorporate a single
stage LC input filter whose elements dominate the input
load impedance characteristic during the turn-on sequence.
The input circuit is as shown in Figure IV.
Finding a resistor value for a particular output voltage, is
simply a matter of substituting the desired output voltage
and the nominal device voltage into the equation and solving for the corresponding resistor value.
Figure V. Connection for VOUT Adjustment
Figure IV. Input Filter Circuit
Enable 2
Share
R ADJ
8.4µH
AFL270xxS
Pin 1
+ Sense
- Sense
Return
To Load
+ V out
0.54µfd
Pin 2
Undervoltage Lockout
A minimum voltage is required at the input of the converter
to initiate operation. This voltage is set to 150 ± 5 volts. To
preclude the possibility of noise or other variations at the
input falsely initiating and halting converter operation, a hysteresis of approximately 10 volts is incorporated in this circuit. Thus if the input voltage droops to 140 ± 5 volts, the
converter will shut down and remain inoperative until the
input voltage returns to ≈ 150 volts.
Output Voltage Adjust
In addition to permitting close voltage regulation of remotely
located loads, it is possible to utilize the converter sense
pins to incrementally increase the output voltage over a
limited range. The adjustments made possible by this method
are intended as a means to “trim” the output to a voltage
setting for some particular application, but are not intended
to create an adjustable output converter. These output
voltage setting variations are obtained by connecting an
appropriate resistor value between the +sense and -sense
pins while connecting the -sense pin to the output return pin
as shown in Figure V. below. The range of adjustment and
corresponding range of resistance values can be determined by use of the equation presented below.


VNOM

Radj = 100 • 
VOUT - VNOM -.025 
Where VNOM = device nominal output voltage, and
VOUT = desired output voltage
8
Caution: Do not set Radj < 500Ω
Attempts to adjust the output voltage to a value greater than
120% of nominal should be avoided because of the potential of exceeding internal component stress ratings and subsequent operation to failure. Under no circumstance should
the external setting resistor be made less than 500Ω. By
remaining within this specified range of values, completely
safe operation fully within normal component derating is
assured.
Examination of the equation relating output voltage and resistor value reveals a special benefit of the circuit topology
utilized for remote sensing of output voltage in the
AFL270XXS series of converters. It is apparent that as the
resistance increases, the output voltage approaches the
nominal set value of the device. In fact the calculated limiting value of output voltage as the adjusting resistor becomes very large is ≅ 25mV above nominal device voltage.
The consequence is that if the +sense connection is unintentionally broken, an AFL270XXS has a fail-safe output
voltage of Vout + 25mV, where the 25mV is independent of
the nominal output voltage. It can be further demonstrated
that in the event of both the + and - sense connections
being broken, the output will be limited to Vout + 440mV.
This 440 mV is also essentially constant independent of the
nominal output voltage. While operation in this condition is
not damaging to the device, not all performance parameters
will be met.
Performance Data
Typical performance data is graphically presented on the following pages for selected parameters on a variety of AFL270XXS
type converters. The data presented was selected as representative of more critical parameters and for general interest in
typical converter applications.
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AFL270XXS Series
AFL270XXS - Typical Line Rejection Characteristics
Measured per MIL-STD 461D, CS101 with 100% Output Load, Vin = 270VDC
AFL27005S
AFL27006S
0
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-100
30
100
1000
10000
50000
30
100
Frequency ( Hz )
1000
10000
50000
Frequency ( Hz )
AFL27009S
AFL27012S
0
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-100
30
100
1000
10000
30
50000
100
1000
10000
50000
Frequency ( Hz )
Frequency ( Hz )
AFL27015S
AFL27028S
0
0
-20
-20
-40
-40
-60
-60
-80
-80
-100
-100
30
100
1000
Frequency ( Hz )
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10000
50000
30
100
1000
10000
50000
Frequency ( Hz )
9
AFL270XXS Series
AFL270XXS Typical Efficiency Characteristics
Presented for three values of Input Voltage.
AFL27006S
AFL27005S
90
90
80
80
160V
160V
70
70
270V
270V
60
60
400V
400V
50
0
20
40
60
50
80
0
Output Power ( Watts )
20
40
60
80
Output Power ( Watts )
AFL27009S
AFL27012S
90
95
80
85
160V
160V
70
75
270V
270V
60
65
400V
400V
50
0
20
40
60
Output Power ( Watts )
80
100
55
0
20
40
60
80
100
120
Output Power ( Watts )
AFL27028S
AFL27015S
95
90
85
80
160V
160V
270V
70
75
270V
400V
65
60
400V
50
55
0
20
40
60
80
Output Power ( Watts )
10
100
120
0
20
40
60
80
100
120
Output Power ( Watts )
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AFL270XXS Series
Typical Performance Characteristics - AFL27005S
Output Load = 100%, Vin = 270VDC unless otherwise specified.
Turn-on Time, No Load
Turn-on Time, Full Load
6
6
5
5
4
4
3
3
2
2
1
1
0
0
-1
-1
70
75
80
85
90
95
70
100
75
80
85
90
95
100
Time from Application of Input Power ( msec )
Time from Application of Input Power ( msec )
Output Ripple Voltage
Input Ripple Current
8
40
4
20
0
0
-4
-20
-40
-8
0
2
4
6
8
0
10
2
400
400
200
200
0
0
-200
-200
-400
200
400
600
Time ( usec )
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6
8
10
Output Load Transient Response
10% Load to/from 50% Load
Output Load Transient Response
50% Load to/from 100% Load
0
4
Time ( usec )
Time ( usec )
800
1000
-400
0
200
400
600
800
1000
Time ( usec )
11
AFL270XXS Series
Typical Performance Characteristics - AFL27015S
Output Load = 100%, Vin = 270VDC unless otherwise specified.
Turn-on Time, No Load
Turn-on Time, Full Load
18
18
16
16
14
14
12
12
10
10
8
8
6
6
4
4
2
2
0
0
-2
-2
50
55
60
65
70
75
50
80
55
60
Output Ripple Voltage
70
75
80
Input Ripple Current
40
8
20
4
0
0
-20
-4
-40
-8
0
2
4
6
8
0
10
2
4
6
8
10
Time ( usec )
Time ( usec )
Output Load Transient Response
10% Load to/from 50% Load
Output Load Transient Response
50% Load to/from 100% Load
800
800
400
400
0
0
-400
-400
-800
-800
0
200
400
600
Time ( usec )
12
65
Time from Application of Input Power ( msec )
Time from Application of Input Power ( msec )
800
1000
0
200
400
600
800
1000
Time ( usec )
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AFL270XXS Series
Typical Performance Characteristics - AFL27028S
Output Load = 100%, Vin = 270VDC unless otherwise specified.
Turn-on Time, Full Load
Turn-on Time, No Load
30
30
25
25
20
20
15
15
10
10
5
5
0
0
-5
60
65
70
75
80
85
90
-5
60
Time from Application of Input Power ( msec )
65
70
75
80
85
90
Time from Application of Input Power ( msec )
Input Ripple Current
Output Ripple Voltage
8
40
4
20
0
0
-4
-20
-40
-8
0
2
4
6
8
0
10
2
4
6
8
Time ( usec )
Time ( usec )
Output Load Transient Response
50% Load to/from 100% Load
Output Load Transient Response
10% Load to/from 50% Load
800
800
400
400
0
0
-400
-400
-800
10
-800
0
200
400
600
Time ( usec )
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800
1000
0
200
400
600
800
1000
Time ( usec )
13
AFL270XXS Series
AFL270XXS to Standard Military Drawing Equivalence Table
AFL27005S
5962-9456901
AFL27006S
5962-9553401
AFL27009S
5962-9553501
AFL27012S
5962-9475301
AFL27015S
5962-9457001
AFL27028S
5962-9556501
Available Screening Levels and Process Variations for AFL270XXS Series.
Requirement
MIL-STD-883
Method
Temperature Range
No
Suffix
ES
Suffix
HB
Suffix
CH
Suffix
-20 to +85°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
¬
ü
ü
ü
Element Evaluation
MIL-PRF-38534
Internal Visual
2017
Temperature Cycle
1010
Cond B
Cond C
Cond C
Constant Acceleration
2001
500g
Cond A
Cond A
Burn-in
1015
48hrs @ 85°C
48hrs @ 125°C
160hrs @ 125°C
160hrs @ 125°C
MIL-PRF-38534
& Specification
25°C
25°C
-55, +25, +125°C
-55, +25, +125°C
Seal, Fine & Gross
1014
Cond C
Cond A, C
Cond A, C
Cond A, C
External Visual
2009
¬
ü
ü
ü
Final Electrical (Group A)
*
per Commercial Standards
14
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AFL270XXS Series
AFL270XXS Case Outlines
Case X
Case W
Pin Variation of Case Y
3.000
ø 0.128
2.760
0.050
0.050
1
12
0.250
0.250
1.260 1.500
0.200 Typ
Non-cum
6
7
1.000
Ref
1.000
Pin
ø 0.040
Pin
ø 0.040
0.220
2.500
0.220
2.800
2.975 max
0.525
0.238 max
0.42
0.380
Max
0.380
Max
Case Y
Case Z
Pin Variation of Case Y
0.300
1.150
ø 0.140
0.25 typ
0.050
0.050
1
12
0.250
0.250
1.500 1.750 2.00
1.000
Ref
0.200 Typ
Non-cum
6
7
1.000
Ref
Pin
ø 0.040
Pin
ø 0.040
1.750
0.375
0.220
0.220
0.36
2.500
2.800
2.975 max
0.525
0.238 max
0.380
Max
0.380
Max
Tolerances, unless otherwise specified:
.XX
.XXX
=
=
±0.010
±0.005
BERYLLIA WARNING: These converters are hermetically sealed; however they contain BeO substrates and should not be ground or subjected to any other
operations including exposure to acids, which may produce Beryllium dust or fumes containing Beryllium
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15
AFL270XXS Series
AFL270XXS Pin Designation
Pin No.
Designation
1
Positive Input
2
Input Return
3
Case
4
Enable 1
5
Sync Output
6
Sync Input
7
Positive Output
8
Output Return
9
Return Sense
10
Positive Sense
11
Share
12
Enable 2
Part Numbering
AFL 270 05 S X / CH
Model
Input Voltage
270 = 270V
28 = 28V
Output Voltage
05 = 5V, 06 = 6V
09 = 9V, 12 = 12V
15 = 15V, 28 = 28V
Screening
Case Style
– , ES
HB, CH
W, X, Y, Z
Outputs
S = Single
D = Dual
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331
ADVANCED ANALOG: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 07/02
16
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